Electromagnetic bell



FIG. 1 is a front elevational view of an electromagnetic bell showing our new design, the rear being the same in appearance as the front;

FIG. 2 is a left side elevational view thereof;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a top plan view thereof; and

FIG. 5 is a bottom plan view thereof. 

The ornamental design for an electromagnetic bell, as shown and described. 